<!DOCTYPE html>
{% extends 'demo/base.html' %}
<html lang="en">
<header>
{% block header %}
    <meta charset="UTF-8">
    <title>CSDN-专业开发者社区</title>
    {% include 'demo/header.html' %}
{% endblock %}
</header>
<body>
{#主体#}
{% block main %}
    {% include 'demo/classes.html' %}
  <div>
{#    super调用父类模板的内容#}
      <div>热点</div>
      <div>头条</div>
   </div>
{% endblock %}
</body>
</html>